Centrifugal pipe mold



1929. w. H. MORGAN, SR 1,726,160

CENTRIFUGAL PIPE MOLD Filed 001;. 25, 1926 7 $7 mu "M Patented Aug. 27, 1929.

UNITED STATES 1,726,160 PATENT OFFICE.

WILLIAM H. MORGAN, $3., or ALLIANCE, OHIO, ASSIGNOR TO WILLIAM H. MORGAN, an,

' or ALLIANCE, OHIO.

CENTRIFUGAL PIPE MOLD.

Application filed October 23, 1926. Serial No. 143,637.

This invention relates to an improvement in pipe molds employed in centrifugal casting of cast iron pipes and it consists broadly in a mold made up of a series of independent units of comparatively small size, each unit having a flanged end secured by screw threads, bayonet joints or other detachable integral means to a flanged end of the next adjacent unit, so' that any one or more units can be readily removed for replacement.

- without disassembling the entire mold.

In the accompanying drawings;

' Figure l is a view in elevation of a section of the mold,

Figure 2 is a view in longitudinal section, Figure 3 is a view in end elevation, Figure 4 is a view of a modification. These molds are intended to be cooled by a water jacket around the outside, but as I make no claim to any feature of the apparatus but the mold, I have not shown the water jacket or any means for rotating the mold or feeding the cast metal into the mold.

The mold, is as shown in Figures 1 and 2 made up of a series of cylindrical units at of comparatively small width, and each is provided at one edge with a flange 5, threaded internally as at 6, to engage corresponding threads on periphery of there cessed seat 7 in the next adjacent section or unit. I prefer to make the flanges 5 in the form of a double flange or step as clearly shown in Figure 2, .the inner face of the outer step 8 of the flange being smooth or .plain as at 9' and closely embracing the outer step 10 of'the next adjacent unit.

Each section of the meld except the outer end sections are flanged at one end of its periphery and recessed atthe opposite edge, except the end sections, which of course are only flanged on their inner faces. With sue a construction, a strong rigid self supporting mold, is formed, the construction being suchthat any section can be removed byh clamping one section and turning the ot er.

In the construction shown in the modification Figure 4, the laminations or rings 4* are provided with a single step, instead of two as shown in Figure 2, and are threaded externally to -,-be engaged by the internally threaded annular rings 10 which as shown are provided on their inner faces with a U-shaped groove which latter rests over the joints between the laminations or rings.

By'making' the rings U-shaped in cross section they act as springs to permit of expan sion and contraction of the molds.

From the foregoing, it will be seen that in the construction shown in Figures 1 and .2 the connecting means are internal, that is, are wholly within the outer periphery of the mold, whereas in Figure 4 the connecting means are external and exposed.

While I have referred to units or sections connected by threads it is evident that they may be connected by bayonet joints, or other means so that the lamination sections or units are connected so'that any unit or units may be removed without disconnecting or separating the other sections.

Among the many advantages of this construction are the following;

1. These laminations being comparatively of small size can be machined and heattreated uniformly so as to secure the same quality of material throughout the length of the mold.

2. By reducing the mold to a series of mar: row laminations the longitudinal thermal stress set up by the molten metal on the interior of the mold is broken up into such small pieces that the stress does not exceed 7 the elastic limit of the metal used. In other words, when the mold is in one long piece, these stresses are cumulative and result in the breaking down of the steel, as this stress becomes several times the elastic limit of the material. J

3. The'us'e of the laminations joined together in the method disclosed permits of certain flexibility in the mold, allpwing it to conform to the stresses set up by the rotation and application of internal heat.

4. Should any of the rings deteriorate in service, new rings can be readily substituted in the portion damaged without necessitating throwing away the entire mold, as must now be done with a single-piece mold. This can be done without danger of throwing the mold out of balance or alignment as would be the case with other forms of laminated moldswhere the whole'mold must be torn down in order to replace part.

5. It may be found in actual practice that it will be desirable to make certain zones of this mold of special steel in order to withstand the excessive temperatures developed at these particular parts. With this in1- provement it will be readily seen that this can be done, as the quality of the steel in laminations can be varied to suit the temperature conditions found in the various portions of the mold.

6. In order to compensate for the various temperatures existing in the mold during casting, the laminated construction permits of varying the thickness of walls between the internal and external or cooled portions so that the metal being cast will be cooled more rapidly at certain points and especially the end which is poured last. This permits the pipe to be cooled and stripped more rapidly than with a mold of uniform thickness as at present used. c

It is evident that many slight changes might be resorted to in the relative arrangement of parts shown and described without departing from the spirit and scope of my invention hence it would have it understood that I do not wish to confine myself to the exact arrangement of parts shown and described but, having fully described myinthe mold may be disconnected from itsadjacent section or sections without loosening or disconnecting the units of the other section or sections.

2. A metal mold for casting pipe consisting of a series ofu-nits or rings, each, except the end sections,'being providedat one edge of its periphery with an internally threaded flange adapted to engage a threaded recessed seat in the adjacent section whereby any one unit of the mold may be disconne'cted from its adjacent sections without loosening or disconnecting the units comprising the other sections.

3. A metal mold for casting pipe, consisting of a series of end and intermediate units or rings, each intermediate unit or ring having stepped flanges adapted to enter a similarly shaped recess in the adjacent unit,

one of the steps of each of the stepped the recessed portion of the adjacent unit whereby any one unit of the mold may be flanges being threaded to engage threads in disconnected from its adjacent sectionor 7 adjacent unit, one of said steps and the corresponding part of the recess of the'adjacent section carrying means for detachably connecting the sections, the other step of the flange and recess being, plain and adapted to snugly fit one within the other whereby any one unit of the mold may be disconnected from its adjacent section or sections, without loosening or disconnecting the units of the other section or sections.

5. A metal mold. for casting pipe consisting of a. series of end and intermediate units or rings each intermediate unit or ring having a stepped flange adapted to enter a similarly shaped recess in the next adjacent section, one of the steps in the flangeand the corresponding step in the recess being screw threaded and the other step in the flange and recess being plain and snugly fitting one within the other.

lntestimony whereof, I have signed this specification.

WILLIAM H. MORGAN, sR. 

